Friction shock-absorbing mechanism



July 3, 1923. l 1,460,580

s. B. HAELTlNL-z FRICTION SHOCK ABSORBING MECHANISM Filed Aug. '7, 1920To all whom it may concern:

Patented July 3, 1923.

UNiTEo-STATES f 1,460,586 PATENroi-Fica s'iAcY is.' HASELTINE, orCHICAGO, inniixiois,'Assrefuoa lro WILLIAM H. MINER, or f criiizv, NEWYoax. f 'f IERICLION SHOCK-ABSORBING MECHANISM.

Application filed August 7, l1920. Serial No. 401,901. f

. B'e it known that I, STAGY B.,HAsE.L'r1Nn, a citizen of the UnitedStates, residing at Chicago, in the countyof Cookand State of Illinois,have invented a certain new and useful Improvement inFrictionShock-Absorbing Mechanisms, of which the following is a full,clear,"concise,and exact description, reference being had'to theaccompanying drawings, forming a par of this specification. Y Thisinvention relates to improvementsy in friction shockabsorbingmechanisms. c

The object of the invention is to provide a high capacity friction shockVabsorbing mechanism. especially adapted for railway draft riggings andwherein are obtained large wearing frictional areas and a combinedgraduatedv frictional-resistance and straight` spring resistance. v Y lInthe drawing forming a 'party' of this specification, Figure 1 -is ahorizontal longitudinal sectional viewfof a portion of a railway draftrigging showing my improvements in connection therewith.. Figures 2 and3 are vertical transverse sectional views taken on the lines 2--2 and 33 respectively of Figure-1. And Figure 4 is aldetail perp lber and eachisformed' on its inner side with spective of one of the frictionshoes.

In said drawing, -10 denote channel shaped'center or draftsillsof arailway car to the inner faces of which are secured front stop lugs 11and rear stop; lugs'12. A portion of a drawbar is'indicatedfa-t-l ltowhich isrigidly attached a yoke 14C-of well-known form. The shockabsorbing 'mechanism proper, hereinafter described, anda front followerareV disposed within the yoke. The yoke and movable parts therein aresupported by a detachablesaddle plate 16.y The ring F; 'apluralityof-combined friction shoes andI wedges G;

and a pressure-transmitting member f f Thecasting A, yas' shown, ispreferably of ycylindrical form' landprovided at its rear end with Aanintegral wall 18 adapted to act' as flat friction surfaces2 ring F.

the rear follower of the mechanism. Approxima-tely at its center vand onthe interior thereof, the casting A is formed with ananiiular. shoulderindicated at 19 to form a seat for the ring F tolimit the inwardmovement ofthe latter with respect to the casthe friction post D, asshown, is'of hexagonal cross section and is'rigidly but detachablysecured at its rear endto the casting A by a bolt 20 and nut 21. Thepost D is formed with an open-sidedv slot indicated at 22 in Figure 3 topermit'the head of the bolt being slipped therein,.the shanklof'the therear wallofthe casting A.- y

The ring F is sho-wn as Inadeinj a single piece to thereby promoteeconomy of manubolt passing' through a suitable opening ini.

*facturel and strength 'in operation. On its outer side,I i. e., theside nearest'the open end of the castingfA, itjisformed witha pluralityof'wedge faces 23--23, the same corresponding? in number-to the-numberof'sides on the ost' D. Onitsinner side,=the ring F isbeve ed `asindicatedat 2li-to cooperate ywith correspondingly beveled anges on theinner-'ends of the shoes E.

lThe shoes E are 'preferably three in numa pair of longitudinally'extending friction Vsurfaces 2.6 intersectingatjan angle of 120o yandadapted 'to cooperate withtwo-adjacent vcorresponding:longitudinallyextending friction surfaces 126-126 on the postjD.Y *On its outer side,each shoe E is provided with another pair of longitudinally.` extending.-27 arranged slightly forwardly divergingwith reference to the`surfaces 26,V Each surface27 is adapted to cooperate withacorresponding longitudinally' extending flat friction surface 127 on acombined wedge-shoejG. The `latter are formed with wedgefaces l123adapted to cof operate with the wedge 'faces 23 of .-i the The-spring Bpreferably consists of inner l `and outer coils, the same 'bearing attheir Vforward ends-against the flanged inner ends of the shoes E. y

The pressure-transmitting I memberl H f is formed at its outer end withan; annular flange 2S contacting directly with-the follower 15 and isextended inwardly vthereof .with a hollow stem 29-adapte`d to looselysurround the outer end of thepost'D, The stein v110 pended hereto.

29 has an inner shoulder 30 with which Yis adapted to cooperate a washer311 detachably bolted to the outer end of the post D so as to hold theparts in assembled relation. It will be noted that the inner end of thevstem 29 engages the outer ends 32 of the shoes E.

The spring C is interposed between the flange Q8 of the member II andthe outer ends of the wedge-shoes G.

The operation is as follows, assuming an inward or bnfling' n'iovementof the dr'awbar, As the follower 15 is moved inwardly the movementthereof is coi'nmunicated to the shoes E through the member H. Duringthe movement of the shoes E', it will be noted that they are resisted'directly by the spring B. In addition, the spring C is graduallycompressed between the flange 28 and the wedge-shoes G so that thelatter are gradually or progressively wedged inwardly by the ring F intotighter 'and tighter frictional 'engagement with the outer surfaces ofthe shoes E, there being also a slight additional wedging action due tothe 'diverg'in'g rfaces 2T of the wedge shoes E co-acting with surfaces127 of the shoes G. This in turn causes 'the shoes E to be pressed moretightly against the post D, thus generating friction on all surfaces o'fthe po'st, all surfaces all surfaces 27, 'and all surfaces 127. Thelength of the casting- A is preferably so made that it will limit theinward movement of the follower 15 and thereby provide a strong columnto transmit the ultimate excessive blows. In release, it will be notedthat the member H is Yfree to move outwardly toward normal full releasedposition Aindependently 'of the shoes E and in this way the spring isfree to extend to its normal condition, thus relieving the pressure onthe wedgeshoes G. This permits the shoes E being projected outwardlyunder 'the influence of the spring B. l

From the preceding description, it will he noted that the fr'ict'ionalresistance is a graduaily increasing one proportionate to the "degree ofCompression of the spring C. The resistance afforded by the spring B is'merely that of an ordinary spring without modic'ation. Inner and outersets of friction -surfaces on the lshoes E are provided 'thus givingunusually large wearing lareas and .promoting the life of the mechanism.

I have herein shown and described what I now consider the preferredmanner of Carrying out the invention, but the same is merely by way ofillustration and all changes and modifications are contemplated thatcome within the scope of the claims ap- I claim: l

v1. In a friction 'shock absorbing mechanism, 'the combination with acentral friction post; of a plurality of friction shoes having innerfriction surfaces cooperable with said post and provided also with outerfriction surfaces; wedging means disposed exteriorly of the, shoes;wedge-shoes cooperable with Ysaid wedging means and the first namedfriction shoes, said wedge shoes and friction shoes sliding relativelyduring a. compression stroke, and spring means encircling said post forrestoring said friction shoes upon removal of the actuating force.

2. In a friction shock absorbing mechanism, th'e combination with anouter `shell having wedging means on the interior thereof; of a frictionpost 'extending longitudinally within the shell and fixed with respectthereto; a plurality of friction shoes disposed around th'e post and'having both inner and outer friction surfaces; friction wedge-shoesinterposed between said wedging means and the first named fri-ctlionshoes and cooperable with the friction surfaces on the outer sides ofthe hitter; and spring means for restoring the friction shoes to normalposition 'upon renroval of the actuating force.

3. In a friction shock absorbing mechanism, the combination with afriction post; of a plurality of friction shoes ldisposed around saidpost and provided with friction surfaces on the inner and youter sidesthereof; spring means for 'directly resisting relative movement betweensaid shoes and post; wedgin-'g means disposed 'exteriorly of the'sho`es; friction wedgeLshoe's interposed between and cooperating with'said wedging means and first named friction shoes; and spring means,independent of the first named spring means, cooperable 'directly with-said wedge-shoes and arranged to be compressed proportionately to themove-` ment of the rst named friction shoes on the post.

4. In a friction shock absorbing Vmechanism, the combination with "a'friction post; of a plurality 'of friction shoes disposed around saidpost Iand provided with fric-1 tion surfaces o'n the inner and outersides thereof; wedgin'g 'means disposed exteriorly ofthe shoes; combinedwedges and friction shoes interposed between said wedging means and thefirst nanied friction shoes; a member adapted to transmit actuatingpressure to said first named friction shoes 4and formed i'n'clependentlyof 'the ylatter; and a spring interposed between s'a'id member and thecombined wedge-shoes.

5. In a friction 'shock absorbingmechanism', the 'combination with afriction shell having wedging vmeans on the interior thereof; of avfriction postl centrally disposed within the Shelli; 'a plurality offriction shoes disposed around said post; fand having both inner andouter lsets of friction surfaces; a .plurality of wed-ge friction shoesinterposed between said wedging means and the first named frictionshoes; a spring interposed between one set of ends of the rstnamed'friction shoes and said shell; means for transmitting pressure tosaid first named friction shoes; and a spring resistance interposedbet-Ween said means and said wedge-shoes, said shell being adapted toact as a column at the end of the permissible compressive action.

6. In a friction lshock absorbing mechanism, the combination with ashell having la centrally disposed friction post; of a wedge ringmounted within said shell and prevented against movement in onedirection relatively thereto; a plurality of friction shoes,

disposed around said post; a spring resistance interposed between theinner endsy of said shoes and the shellgaplurality of wedge-shoesinterposed between said ring and rst named frictionshoes; a pressure;

transmitting member engaging the .other ends of said first ynamed`friction shoes; and a spring resistance interposed between saidpressure-transmitting member 4vand lthe.

wedge-shoes. Y

7. In a friction shock absorbing mechanism, the combination Vwith acentral friction member having. peripherally located longitudinallyextending friction surfaces;

l 'of a plurality of friction shoes encircling said friction member andfrictionally cooperable with said friction surfaces thereof;

an outercasng shoes and locatedl on the'interiory ofthe casspring meansdisposed withinsaid casing.

8.'In a frictionk shock absorbing Lmecha: nism', the combination withaVfriction post; l of a plurality of slightly tapering"friction vshoesdisposed around said post and providl v ed with friction surfaces yonthe inner and o-utersides thereof; spring means for` di-Q; v rectlyyresisting relativemoveinent between said shoes and post; wedcringmeansdisposed exteriorly of the shoes; friction wedge shoes interposedbetween and cooperating withv Y said wedgeymeans and first namedfrictiony shoes; and spring means independent ofthe iirst named lspringmeans, cooperable directly with saidwedge'shoes and arranged f to becompressed proportionately to the 'movement of the first named frictionshoesl on` the post."` i f l, v In witness that I' 'claim the foregoingI `havehereunto subscribed name-.this 13th? 60 day of July, 1920;

Witness l y o CARRIE (iri-iILING.V

wedging means fixed with! respect to said casing duringa compressionstroke, between said casing :and friction sTAoY e. Hiisnijriniaf",

